Fix typo

fairseq/criterions/label_smoothed_cross_entropy.py

@@ -49,7 +49,7 @@ class LabelSmoothedCrossEntropyCriterion(FairseqCriterion):
         sample_size = sample['target'].size(0) if self.args.sentence_avg else sample['ntokens']
         logging_output = {
             'loss': utils.item(loss.data) if reduce else loss.data,
-            'nll_loss': utils.item(nll_loss.data) if reduce else loss.data,
+            'nll_loss': utils.item(nll_loss.data) if reduce else nll_loss.data,
             'ntokens': sample['ntokens'],
             'sample_size': sample_size,
         }